package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.File;
import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Slf4j
@Service
@Transactional
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {
    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;

    //用户下单
    @Override
    public void submit(Orders orders) {
        //获取当前用户的ID 在封装类中有保存好和可以获取的ID
        Long userId = BaseContext.getCurrentId();
        //查询当前用户的购物车数据,在他的实体类中查找
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        //用数据库里面的id和userid进行对比
        wrapper.eq(ShoppingCart::getUserId, userId);
        //如果相同那么就把wrapper封装到集合里面去
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(wrapper);
        //如果shoppingCarts为空,或者他的长度为0
        if (shoppingCarts == null || shoppingCarts.size() == 0) {
            //那么我们就用自己创建的异常来返回一段话
            throw new CustomException("购物车为空,不能下单");
        }
        //查询用户数据用userSERVICE中继承的来查询id
        User user = userService.getById(userId);
        //查询地址数据
        Long addressBookId = orders.getAddressBookId();
        //用接口实现的方法来查询他的id
        AddressBook addressBook = addressBookService.getById(addressBookId);
        //如果查询到的id为空
        if (addressBook == null) {
            //那么就用自己定义的异常来返回一句话
            throw new CustomException("用户地址信息有误,不能下单");
        }
        //雪花算法的IDworker的工具类用来生成id
        long orderId = IdWorker.getId();//D订单号
        //多线程的时候保证线程安全的类
        AtomicInteger amount = new AtomicInteger(0);
        //组装订单明细信息    stream提取list对象的莫一列值然后通过该对象循环遍历   这个map((item)是用来遍历的,也可以把括号去掉,或者用filter()
        List<OrderDetail> orderDetails = shoppingCarts.stream().map(item -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());

            amount.addAndGet(item.getAmount().multiply(new
                    BigDecimal(item.getNumber())).intValue());
            return orderDetail;
            //将这里面的所有元素都放入list中
        }).collect(Collectors.toList());
        //组装订单数据
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" :
                addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" :
                addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" :
                addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" :
                addressBook.getDetail()));
        //向订单表插入数据,一条数据
        this.save(orders);
        //向订单明细表插入数据多条数据
        orderDetailService.saveBatch(orderDetails);
        //清空购物车数据
        shoppingCartService.remove(wrapper);

    }
}


